This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A374647 #7 Jul 25 2024 14:07:37
%S A374647 1,1,2,3,12,20,30,210,336,504,5040,7920,11880,154440,240240,360360,
%T A374647 5765760,8910720,13366080,253955520,390700800,586051200,12893126400,
%U A374647 19769460480,29654190720,741354768000,1133836704000,1700755056000,47621141568000,72684900288000
%N A374647 a(n) = n! / floor(2n/3)!.
%t A374647 Table[n!/(Floor[2 n/3]!), {n, 0, 30}]
%Y A374647 Cf. A000142, A081125, A355988.
%K A374647 nonn
%O A374647 0,3
%A A374647 _Clark Kimberling_, Jul 22 2024